<font color="#333399"><font>Hi,<br><br>A recent thread kept my attention recently: <a href="http://forum.nginx.org/read.php?2,226327">http://forum.nginx.org/read.php?2,226327</a><br><br>I don't have such a big trouble, but I don't see how to solve it.<br>

<br>My server usually serves small files suchas classical web pages.<br>On a particular location, though, I serve big files (around 100MB+).<br><br>I noticed that when those files were served, there was 'bumps' in the transfer rate, whether the trasnfer stalled for 1s or the transfer rate downgraded to 500Kb/s during the same period.<br>

Those bumps were monitored server-side, so it is not some trouble in any network in the middle.<br>I ensured that the only service using significant bandwith would be Nginx.<br><br>I guess I am experiencing some disk I/O speed limitations.<br>

Thus, I tried to use aio on that location:<br>aio on;<br>directio 4m;<br>output_buffers 1m; (I tried 512k first hand)<br><br>The bumps are still there, appearing randomly but quite often and regularly on the long shot.<br>